Science & Mathematics - 22 September 2007

Ok I have to write a paper about thermal expansion in solids,liquids, and gases. I don't understand it at all. Do they change states or what ? Please help !!!

2007-09-22 14:12:19 · 5 answers · asked by ilovekaseykahneforever 1 in Earth Sciences & Geology

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Can you figure out this tricky math problem? (10 points to the first right answer! You must show logic behind answer.)

Lockers in a row are numbered 1, 2, 3, ..., 1000. At first all the lockers are closed. A person walks by, and opens every other locker, starting with locker #2. Thus lockers 2, 4, 6, ..., 998, 1000 are open. Another person walks by and changes the "state" (i.e.,closes a locker if it is open, opens a locker if it is closed) of every third locker starting with #3: 3, 6, 9... Then another person changes the state of every 4th locker. The process conintues until no more lockers can be altered. Which lockers will be closed?

2007-09-22 14:11:38 · 2 answers · asked by Eric and Alex K. 1 in Mathematics

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series question.?

The sum of 25 consecutive odd number is 1275.
Find the largest and smaller of these numbers.

2007-09-22 14:10:33 · 3 answers · asked by Anonymous in Mathematics

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Nuclear Arsenal?

Okay. I've made the bomb's shell out of an old 69' ford hood, fashioned a trigger mechanism from a stop watch and a clock radio. I've got enough plutonium for a 7 mile radius but I'm looking for 10. and I've managed to make it tick with all those complicated innards.

any ideas on where I can find some plutonium?

by the way, I live in the New York tri-county area.

2007-09-22 14:05:38 · 7 answers · asked by monstermoshmaster 2 in Engineering

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is tonight a full moon?

2007-09-22 13:51:20 · 7 answers · asked by Anonymous in Astronomy & Space

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simplify complex number?

i^65

2007-09-22 13:49:20 · 2 answers · asked by Anonymous in Mathematics

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Aliens living in Georgia?

I believe that there are Aliens living in Georgia And they are using their cell phone and car remotes to somehow harm humans. And I think they know that I know.

2007-09-22 13:46:49 · 2 answers · asked by j 1 in Other - Science

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can god time travel?

2007-09-22 13:46:47 · 7 answers · asked by Anonymous in Physics

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i still dont get this one limit question?

lim
x->2.5

25 - 4x^2 / 2x + 5

2007-09-22 13:45:33 · 4 answers · asked by jake p 2 in Mathematics

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need help with problem in math?

n is an integer. The reste of n divided by 8 is 5.
whats is the rest of the division of n+1 divided by 8?
what is n?
whats is the reste of the divison of n+4 divided by 8

2007-09-22 13:38:35 · 4 answers · asked by Chantal S 1 in Mathematics

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What do you think a solar eclipse would look like if more than one Moon were involved? How do i draw it?

That's the question i have to answer. Well i actually have to draw it but i have no clue how to do so.
For example
Do i draw a a sun covered by a moon and next to it a second moon?
it doesn't make any sense! help!

2007-09-22 13:28:24 · 3 answers · asked by Agata 5 in Astronomy & Space

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Solve x^4-16=0 in complex number system. Please explain. Thanks?

2007-09-22 13:27:26 · 5 answers · asked by Anonymous in Mathematics

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Parametrics...?

Given the parabola x² = (1/2)y, for what values of m does the line y=m(x+1)
(a) have 2 points of intersection?
(b) have one point of intersection?
(c) have no points of intersection?

I think once I understand the first one I may be able to understand the others, but I have no idea how to do the first one. Help please!!

2007-09-22 13:26:48 · 1 answers · asked by mj_ 2 in Mathematics

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Confusing Physics Question about initial and final velocity?

I'm taking honors physics this year, and I've come across a problem that I really don't understand.
Here's the question:

"A student throws a set of keys vertically upward to her sorority sister, who is in a window 4.00 m above. The keys are caught 1.50 s later by the sister's outstretched hand.
(a) With what initial velocity were the keys thrown?
(b) What was the velocity of the keys just before they were caught?"

Here is what I'm assuming from the problem:
(a) is asking initial velocity (v0)
(b) is asking final velocity (vf)
delta d is 4.00 m
delta t is 1.50 s
Average Velocity is 2 and 2/3 m/s (Because velocity = distance/time)

I can't for the life of me figure out how to find the initial and final velocities. Can someone please explin this to me?

Thanks!!!

2007-09-22 13:23:47 · 3 answers · asked by mew1033 2 in Physics

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Albert Einstein vs Sir Isaac Newton, who is the greater?

2007-09-22 13:22:31 · 7 answers · asked by sed 1 in Physics

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WHat is an example of a group with 105 elements? And what are two examples of groups with 44 elements?

Abstract algebra

2007-09-22 13:22:15 · 3 answers · asked by Anonymous in Mathematics

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help for max min problem, is this right?

problem:
find absolute madimum and minimum values, if they exist, over the indicated interval
the equation is
f(x) 3/4x^4 + 1/3x^3 -3x; [-1,3]

I got no max, and min of .90033

is that right?

2007-09-22 13:21:03 · 4 answers · asked by jake p 2 in Mathematics

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Physics Homework Help 3?

5. In 1990, the women's record in bicycling was set by a Russian athlete. Starting at a certain speed, the bicyclist traveled 2 x 10^2 m. Suppose the initial velocity was 12 m/s and the acceleration was constant. If the final velocity was 25 m/s, what was the acceleration? How long did it take to travel this distance?

2007-09-22 13:19:18 · 1 answers · asked by KatieLC91 1 in Physics

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Which of the following would you least expect to find in CaCl2 (aq)?

a. H2O molecules
b. CaCl2 molecules
c. Ca^2+ ions
d. Cl- ions

2007-09-22 13:18:44 · 3 answers · asked by Anonymous in Chemistry

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Physics Homework Help 2?

3. The polar bear is an excellent swimmer, and it spends a large part of its time in the water. Suppose a polar bear wants to swim from an iceberg to a place in shore where seals gather. The bear starts swimming at a velocity of 2.60 m/s. By the time it reaches the shore, its velocity has decreased to 2.20 m/s. If the polar bear's swim takes 9 minutes and it has a constant deceleration, what is the distance traveled by the polar bear?

4. A daredevil motorcycle rider pops a wheelie at a velocity of 8 m/s. He finds he needs to speed up to maintain this stuntm and so accelerates at 2 m/s^2 and travels 40 m during this acceleration.
a. What is the rider's velocity after the acceleration?
b. How much time did it take to travel this distance?

2007-09-22 13:18:07 · 2 answers · asked by KatieLC91 1 in Physics

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need further help, please?

Physics question, I can't seem to get this problem, please help.?
Two forces, 381N at 8deg. & 307N at 25deg. are applied to a car in an effort to accelerate it.?
What is the magnitude of the resultant of
these two forces?

What is the direction of the resultant force (in re-
lation to forward, with counterclockwise con-
sidered positive)?????
within the
limits of -180deg to 180deg

Additional Details

655.52 was the answer for the first question... and so if 655.52 is the resultant force, what is the direction of deg?

2007-09-22 13:18:01 · 3 answers · asked by ? 1 in Physics

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Doing someone's homework?

if you do someone's elses math homework will it get you suspended or expelled?

2007-09-22 13:15:04 · 5 answers · asked by Tiffany T 1 in Mathematics